Posts in English
VoLTE with SIM7600E-H HAT
- 13 December 2025
Making VoLTE calls with SIM7600E-H modem over o2/Telefonica Germany carrier network
This post is part of my Press 1 for Fun project and still a work-in-progress.
Learning Content as Code
- 12 December 2025
Building a Libre Open-Source e-Learning Authoring Toolchain
Most people have taken an online course at some point, maybe a workplace training, a coding bootcamp, or a university module. Behind the scenes, those courses are usually built with specialized software platforms. They often come with drag‑and‑drop editors, proprietary formats, and limited ways to move your content elsewhere. If you switch platforms, you often have to rebuild everything from scratch.
Press 1 for Fun
- 06 December 2025
Turning a regular SIM card into a hotline with menus and mischief
On the surface, it sounds delightful: take a plain SIM card, wire it into a PBX, and suddenly you’ve got your own hotline with IVR menus, jokes, and playful diversions. Press 1 for fun, press 2 for chaos, press 3 for whatever you dream up. It’s the kind of tinkering that makes telephony feel mischievous again.
Winter Chills
- 01 December 2025
Leaf-like frost designs shimmered on my windowpane, illuminated by the hush of winter night.